Question

Nitrogen laser produces a radiation at a wavelength of `33.71 nm`. If the number of photons emitted is `5.6xx10^(24).` calculate the power of this laser.

Answer 1

Power of laser = Energy with which it emits photons
Power `= E = (Nhc)/(lambda)`
Where,
N = number of photons emitted
h = Planck’s constant
c = velocity of radiation
`lambda` = wavelength of radiation
Substituting the values in the given expression of Energy (E):
`E = ((5.6 xx 10^(24))(6.626 xx 10^(-34)Js)(3xx10^(8)ms^(-1)))/((337.1 xx 10^(-9)m))`
`= 0.3302 xx 10^(7) J`
`= 3.33 xx 10^(6) J`
Hence, the power of the laser is 3.33 × 10^(6) J`.